(R: 2,6) - x²-8x+12=0
(R:2,-4) - x²+2x-8=0
(R:VAZIO) - x²-5x+8=0
(R:3/2) - 4x²+9=12x
(R:-3) - 2x²=-12x-18
(R:-1,-2) - x²+3x-6=-8
(R:2/5) - 25x²=20x-4
(R:1) - 4x²-x+1=x+3x²
(R:1,4) - 4+x(x-4)=x